Charts & Graphs
A resource for working with Charts and graphs. Mostly a compendium of libraries and third party integrations.
Google Charts
docs:Â https://developers.google.com/chart/interactive/docs/indexÂ
examples:Â https://developers.google.com/chart/interactive/docs/gallery
Charts.js
6 chart types
nice animations; very tin js, leverages HTML5 canvas + cross platform fallbackÂ
project:Â http://www.chartjs.orgÂ
code:Â https://github.com/nnnick/Chart.jsÂ
docs:Â http://www.chartjs.org/docs/
examples: Â
D3
good for inventing things
project:Â http://d3js.orgÂ
code:Â https://github.com/mbostock/d3
drupal module: https://www.drupal.org/project/d3Â
API:Â https://github.com/mbostock/d3/wiki/API-Reference
examples:Â https://github.com/mbostock/d3/wiki/Gallery
High Charts
free for non-profits
supports line, spline, area, areaspline, column, bar, pie, scatter, angular gauges, arearange, areasplinerange, columnrange and polar chart
also maps with touch support.
 Highcharts has recently put a lot of work into making their charts more accessible!
project:Â http://www.highcharts.comÂ
drupal module:Â https://www.drupal.org/project/highcharts
   https://www.drupal.org/project/charts
code:Â
https://github.com/highslide-software/highcharts.comÂ
docs:Â http://www.highcharts.com/docsÂ
examples:Â http://www.vitalsigns.mtc.ca.gov/transit-ridership#chart-2
   http://www.highcharts.com/demo
   http://www.highcharts.com/maps/demoÂ
Charts.module
A drupal module with API that supports High Charts and Google Charts libraries. Views integration
project/
code:Â https://www.drupal.org/project/chartsÂ
docs:Â https://www.drupal.org/node/2423033Â +Â https://www.drupal.org/node/233753Â
Resources
 http://www.sitepoint.com/15-best-javascript-charting-libraries/